Mesembrius longipilosus Jordaens, Goergen & De Meyer, 2021

Jordaens, Kurt, Goergen, Georg, Skevington, Jeffrey H., Kelso, Scott & Meyer, Marc De, 2021, Revision of the Afrotropical species of the hover fly genus Mesembrius Rondani (Diptera, Syrphidae) using morphological and molecular data, ZooKeys 1046, pp. 1-141 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.1046.57052
publication LSID	lsid:zoobank.org:pub:66E61C4E-FAFE-45DE-9145-DB38199BDEC3
persistent identifier	https://treatment.plazi.org/id/F22BE141-7E79-4C9B-995B-DCA4B9BCC126
taxon LSID	lsid:zoobank.org:act:F22BE141-7E79-4C9B-995B-DCA4B9BCC126
treatment provided by	ZooKeys by Pensoft
scientific name	Mesembrius longipilosus Jordaens, Goergen & De Meyer
status	sp. nov.

Treatment

Mesembrius longipilosus Jordaens, Goergen & De Meyer sp. nov. Figs 12 View Figures 11, 12 , 55 View Figures 52–57 , 92 View Figures 89–94 , 134 View Figures 131–134 , 162 View Figures 159–162 , 214 View Figures 205–216

Differential diagnosis.

Mesembrius longipilosus sp. nov. males lack an apical pile brush on the profemur and have an unmodified metatibia. The proximal ventral section of the profemur has 3-4 long black pile and the metafemur is covered with long, thin yellow pile and some shorter and thicker black pile on the ventral side, except on the extreme distal end where the black and yellow pile is equally long. The pair of maculae on tergite II are very large and rounded. The species resembles M. senegalensis , but differs in the shape of the maculae on tergite II (rounded in M. longipilosus sp. nov.; rectangular in M. senegalensis ) and the presence of some long black pile on the proximal ventral side of the metafemur (absent in M. senegalensis ). The female is unknown.

Examined material.

Mesembrius longipilosus Jordaens, Goergen & De Meyer: Holotype, male “HOLOTYPUS” " Entebbe , UGANDA // 2.III.1972 // H. Falke // In forest " " Mesembrius // sp. 7 // Det J.R. Vockeroth " " Mesembrius longipilosus // Det. K. Jordaens, 2019" " Barcode of Life // DNA voucher specimen // Smple | CNC DIPTERA 102305 // BOLD Proc. ID: CNCDB1109-11" " CNC DIPTERA // # 102305" [CNC].

Paratype: Uganda • 1♂; near Entebbe ; 23-31 Jan 1972; 1160 m; H. Falke leg.; CNC Diptera 102306 (head and abdomen lost) [CNC] .

Description male

(Fig. 12 View Figures 11, 12 ). Body length: 8.6 mm. Wing length: 7.2-7.7 mm.

Head (Fig. 55 View Figures 52–57 ). Eyes bare; dichoptic, distance between eyes approx. the width of ocellus. Face yellow with dark medial vitta; white pilose; white pollinose. Vertical triangle black with yellow and black pile; yellow pollinose on lower half. Distance between lateral ocellus and eye margin approx. 1/2 width of ocellus. Frontal triangle black; white pilose; white pollinose. Frontal prominence shiny black. Occiput yellow; yellow pilose with interspersed short, black setulae; yellow and white pollinose. Antenna black; postpedicel white pollinose, antennal arista reddish-brown.

Thorax. Scutum black; white pilose, with three dorsal, well-demarcated yellow-white pollinose vitta which are connected at posterior end; with lateral, yellow-white pollinose vitta. Scutellum yellow-brown; yellow pilose.

Legs. Femora dark chocolate-brown, tibia and tarsi orange-brown. Proleg (Fig. 162 View Figures 159–162 ): Femur without apical pile brush; yellow pile ventrally long in proximal half, shorter in distal half; ventrally 3-4 black pile at basal 1/3. Tibia yellow and black pilose. Tarsi black pilose dorsally, yellow-orange pilose ventrally. Mesoleg: Similar to proleg; with black and yellow pile on basitarsus. Metaleg: Femur with long yellow pile anteriorly and shorter pile, posteriorly; ventral pile scarce, yellow and black, the black pile is longer at proximal half than at distal half. Tibia unmodified; with long, yellowish pile and scarce black pile on distal half. Tarsi black pilose dorsally, orange pilose ventrally.

Wing (Fig. 134 View Figures 131–134 ). Entire wing uniformly dense microtrichose.

Abdomen (Fig. 92 View Figures 89–94 ). Tergite II with pair of very large, yellow to orange rounded maculae; black marking hourglass-shaped, but the posterior part is smaller compared to the anterior part; yellow pilose. Tergite III almost entirely orange with small medial black maculae; yellow pilose. Tergite IV with anterior white pollinose band; black on posterior 1/3; yellow pilose.

Genitalia (Fig. 214 View Figures 205–216 ). Epandrium: Dorsal lobe of surstylus elongated, more or less rectangular with upwardly curved apex, with short, black spines in distal half; dorsolaterally with a few longer, black setulae; dorsally and laterally with long, yellow pile. Ventral lobe of surstylus with large expansion ventrally, with, on ventral side of the expansion, short black setulae.

Female.

Unknown.

Distribution.

Uganda.

Comments.

Mesembrius longipilosus sp. nov. is a new species which is only known from two male specimens from Uganda (Entebbe). The male genitalia look similar to those of M. capensis , but the black setulae on the ventral expansion of the ventral lobe of the surstylus are fewer in number and much shorter. No DNA barcodes are available.

Etymology.

The specific epithet Mesembrius longipilosus (Latin for hairy, covered with long pili) refers to the long, thin yellow pile on the metalegs. It is to be treated as an adjective (nominative singular masculine).